Air-compressor



(No Model.) W. WAN G.

AIRUOMPRESSOR,

No. 255,222 Patented Mar. 21,1882,

WITNESSES:

Y E N R 0 w A N. PETERS Pbow-Lflho' m her. Washington. 0.6.

UNITED STATES PATENT OFFICE.

WILLIAM WANG, OF PHILADELPHIA, PENNSYLVANIA.

AIR-COMPRESSOR.

SPECIFICATION formingpart of Letters Patent No. 255,222, dated March 211882.

Application filed January 7,1882. (No model.)

T 0 all whom it may concern:

Be it known that I, WILLIAM WANG, a citizen of the United States,residing in the city and county of Philadelphia, State of Pennsylvania,have invented a new and useful Improvement in Air-Oompressors,whichimprovementis fully set forth in the following specification andaccompanying d,rawings,in which Figure 1 is a partial side elevation andlongitudinal vertical section of the air-compressor embodying myinvention. Fig. 2 is a transverse section thereof in line 00 0:, Fig.1.Fig. 3 is a top view of the central portion of the interior thereof.Fig.4is a longitudinal section in line 3 12 Fig. 3. Fig. 5 is atransverse section in line 2 2, Fig. 4.

Similar letters of reference indicate corresponding parts in the severalfigures.

My invention consists in improvements in automatically-actingair-compressors, as will be hereinafter fully set forth.

Referring to the drawings, A represents a horizontally-arrangedvalve-chamber; and B Brepresent horizontally-arranged cylinders, which'are connected to the ends of the chamber A, the latter being properlysupported on a base or stand, 0.

D represents a piston-rod, which is passed through the'plates or caps E,which separate the chamber A from the cylinders B B, the ends ofthe rodin the cylinders B B carrying pistons F F. On the piston-rod, within thethe chamberA,is looselyfitted a balanced piston,G,Which moves incylinders G, which are cast with the plates or caps E and projecthorizontally toward each other, as shown in Fig.1.

H represents a slide-valve,which is fitted to the neck of the balancedpiston G, and its seat H is at the base of the chamber A, the seathaving ports a, which lead to openings 1) in the caps E,said openingscommunicating with the cylinders B B and an exhaust-port, I), openingoutwardly. The piston G is hollow, the inner wallsof the ends beingthreaded, so that packing a maybe screwed into said ends, the rod 1)passing through thecenter ofthe packing, by which provision water isprevented from passing from one cylinder G through the piston to theopposite cylinder G.

Cast with each cylinder G is a valve chamber, J, within which is aplunger-valve, K, the

two plunger-valves being coupled bya link,d. (See Figs. 3'and 4.) anexhaust-port, c, which communicates with a port, 6, in the cylinder G,(shown full in the left-hand side of chamber A, Fig. 1, and dotted inFigs. 2 and 4,) said port 6 also communicating with a port,f, formed inthe cap E, said port f communicating with a port, f, which is formed inthe seatof thevalve Hand leads to the exhaust-port b of the apparatus.(See Fig. 2.) The outer ends of the plungervalves project into thecylinders B and B, and said ends are formed with grooves or necks f solocated that when the valves are moved to their full stroke the spacesof the grooves are in communication with the ports c.

I At the outer ends or heads of the cylinders B B are air-receivingvalves L, which open M, which connects the two pipes M.

In the cap to which the couplinggis screwed is a. spring-pressed valve,h, said valve closing inwardly, the object of which is that when thecompressed air leaves the cylinder B or B it opens said valve and passesinto the feedpipe M, and when the piston which has justforced out theair recedes the back pressure of compressed air in the pipe M and thespring g coses the valve h and holds it on its seat.

The chamber A is supplied with water by means of the pipe N, whichcommunicates with an inlet, it, formed in the bottom of the wall of thechamber A, said chamber being thereby filled throughout with water.

The pistons F are shown moved to the right, and the exhaust-port b is incommunication with the right-hand cylinder B, the water in said cylinderthus exhausting or being discharged, the balanced piston G being also tothe right, and the left-hand piston having In each plunger-valve is- IOCmoved the plunger-valve likewise to the right, the left-hand port abeing in communication with the chamber A. Water in the chamber A nowflows through the left-hand port, and reaches the left-hand cylinder andacts on said cylinder so as to move it to theleft. The air in theleft-hand cylinder in front of the piston is forced out into the pipe M,and meanwhile the valve L of the right-hand cylinder opens andreplenishes the latter cylinder with air. hen the pistons F have madetheir full stroke the right-hand piston F strikes the right-handplunger-valve K and moves it to the left. This brings the groove orneckf, which was covered by the cap E, into position directly aside ofthe opening port 0 of the right-hand cylinder G, whereby water enterssaid cylinder from the chamber A, and thus moves the balance-piston G tothe left, and also shifts the valve H to the left. Thiscloses theleft-hand port and opens the exhaust, so

that the latter is in communication with the left-hand cylinder A,whereby the water in said cylinder may exhaust, and the right-hand porta is uncovered, so as again to supply the right hand cylinder; but thewater in the right-hand cylinder G, that has shifted the balance piston,requires to be discharged. Now, as soon as the pistons F move to theright the left piston strikes the adjacent plunger-valve K and movesboth valves K to the right. This causes the groove or neck of theright-hand plunger-valve to be covered by the cap E, and the right handport 0 is also cut oil by the solid part of the right-hand plungervalve.This causes the port 0 of the righthand plunger valve to be incommunication with the right hand cylinder, whereby the water in thelatter immediately enters said port, and, flowing through the portf,reaches port f, and consequently the exhaust-port 1). Meanwhile thegroove or neck of the left-hand plunger -valve is uncovered and waterenters the port 0 of the left-hand cylinder G, and so presses on thebalanced piston as to shift it to the right, and the other operationsare similar to those above described, and therefore repeated as long asthe apparatus is required to render service. The caps E having chambersand cylinders J G cast with them render the parts strong and avoidjoints, which are liable to break.

Having thus described my invention, what Iclaim as new,and desire tosecure by Letters Patent, is-

l. Stationary cap E, cast in one piece with a cylinder, G, and avalve-chamber, J, in combination with a plunger or valve moving in saidchamber and recessed to afford a passage, said cap closing said passagein one position of said plunger, substantially as set forth.

2. The caps or plates E, each having a valvechamber, J, and a cylinder,G, cast with it on its inner side, the inner ends of said cylindersbeing open,in combination with a piston working in said cylinders,substantially as set forth.

3. In combination with chamber A and the two compressing cylinders, theindependent valve-cylinders G, arranged within said chamber and openinginwardly, and the hollow balaneed piston G, reciprocating in saidcylinders, substantially as set forth.

4. The piston-rod D, having hollow balanced piston G fitted to slidethereon and passing through stationary caps E and open-end cylindersG,incombination with said piston, caps, and cylinders, and the centralpacking, a, substantially as set forth.

5. In combination with chamber A and the cylinders B B, arranged at theends thereof, the caps E, having in wardl y-openin g cylinders G ontheir inner faces, the piston-rod D, passing through the said chamber,caps, and cylinders, and the pistons F and G, carried by said rod,arranged and operating substantially as set forth.

6. The plungervalve K, with port a and neekf, the valve-chambers J, thecylinders G, with ports 6, the caps E, with portsf, the seat withport-f, and the exhaust-port 1), combined and operating substantially asand for the purpose set forth.

7. The cylinders B B and chamber A, in combination with theseparating-caps E, having openings 1), the valve H, and valve-seat H,with ports a a 12, substantially as and for the purpose set forth.

8. The plunger-valves, with ports 0, the cylinders G, with ports 0, thecaps E, with ports f, the balance piston G, the cylinders, and chamber,combined and operating substantially as and for the purpose set forth.

9. The chamber A and cylinders 13 B at the ends thereof, in combinationwith the pistonrod D, provided with balanced piston G within saidchamber, anti pistons F within said oyl-' inders, and theoutwardly-opening valves gin the ends of said cylinders, substantiallyas set forth.

WILLIAM ANG,

Witnesses:

JOHN A. WIEDERsHnIM, W. F. KIRcrrER.

